NDLI: A preliminary study on the offshore stratigraphy in Hong Kong and its hydrogeological implications

Content Provider	Springer Nature Link
Author	Kwong, Hiu Tung Jiao, Jiu Jimmy Chan, Lung Sang
Copyright Year	2016
Abstract	Offshore groundwater reserves, commonly sequestered in relict fluvial systems, have been reported globally. In Hong Kong, submarine terrestrial sediments are the evidence of local fluvial systems during glacial periods and they probably sequester relatively fresh water. This study aims to locate these sand deposits. An offshore vibrocore in the southwestern waters of Hong Kong was analysed for its geophysical and elemental properties in order to deduce the palaeoenvironment. Also, marine seismic profiling was adopted at two selected sites to depict the distribution of sand and gravel deposits and to estimate the average thickness of these aquifer materials. A four-unit sequence was noted with increasing marine influence since 8 ka BP. This agrees with the hypothesis that the offshore groundwater reserves are the relics of flow systems during glacial periods. The extensive sand deposits in the study areas are often shielded by sufficiently thick marine clay against vertical salinisation, allowing fresh groundwater to be preserved. The average thickness of these aquifer materials is about 11 m at the study sites. If these sand deposits are recharged through onshore outcrops, the reserves may be a sustainable water resource.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	11
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Marine seismic profiling Offshore groundwater resources Palaeohydrology Submarine stratigraphy Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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